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Stanley Personal Protection Multi-Containment Replacement Cartridges RST-64016 allow you to reuse your MC/P-100 Half-Mask Respirator as many times as you like, further protecting your lungs from hazardous irritants. These replacement cartridges are an essential component of respirators, the very thing that gives that lab safety gear its power to filter harmful airborne chemicals. The Stanley lab safety masks are capable of filtering organic vapors, ammonia, methylamine, hydrogen chloride, and a host of other dangerous chemicals when they're equipped with these Stanley Personal Protection Multicontaminant Filter Cartridges. Stanley Personal Protection has included two MC cartridges in each of these sets. Keep your respirators operating at their highest efficiency by stocking plenty of Stanley Personal Protection Multi-Contaminant Respirator Cartridges.